As per the prophet Muhammad (PBUH) he said:

"The signs of a hypocrite are three:
1. Whenever he speaks, he tells a lie.
2. Whenever he promises, he always breaks it (his promise ).
3. If you trust him, he proves to be dishonest. (If you keep something as a trust with him, he will not return it.)"

So being punctual is something that all should be. For me i am always punctual unless there are things that are out of my hand and cannot control which causes me to be late.